Errors on AIX with C++20

[techmaddy]

I am trying to compile the boost beast sample programs using boost-1.87.0

I am getting the below errors:

In file included from /boost/boost/asio.hpp:38:
In file included from /boost/boost/asio/basic_readable_pipe.hpp:39:
In file included from /boost/boost/asio/detail/reactive_descriptor_service.hpp:32:
In file included from /boost/boost/asio/detail/descriptor_ops.hpp:174:
/boost/boost/asio/detail/impl/descriptor_ops.ipp:197:25: error: implicit conversion from 'unsigned long' to 'int' changes value from 18446744071562356350 to -2147195266 [-Werror,-Wconstant-conversion]
  197 |     result = ::ioctl(d, FIONBIO, &arg);
      |              ~~         ^~~~~~~

So, was wondering if any have faced the same issue?

[techmaddy]

I ended up updating the files as below where ever FIONBIO is being used.

#if defined(_AIX)
    result = ::ioctl(d, static_cast<int>(static_cast<unsigned int>(FIONBIO)), &arg);
#else
    result = ::ioctl(d, FIONBIO, &arg);
#endif   

[mbs-c]

It's worth noting that only 64-bit builds (OBJECT_MODE=64) are affected.